A vulnerability in cyber security is a weakness or flaw in software, hardware, configurations, or processes that can be exploited by threat actors to gain unauthorised access or disrupt operations. In Australia, vulnerabilities are frequently identified in outdated systems, unpatched applications, misconfigured cloud environments, and weak access controls. Cybercriminals actively scan for vulnerabilities to deploy ransomware, steal sensitive information, or compromise supply chains. Effective vulnerability management involves continuous scanning, prioritisation based on risk impact, patch management, and remediation tracking. Aligning vulnerability management practices with frameworks such as the ACSC Essential Eight and ISO 27001 strengthens organisational resilience. Proactively identifying and addressing vulnerabilities reduces breach likelihood, supports regulatory compliance, and protects business continuity in an increasingly complex threat landscape.